TR_ITINERARYITEM_INSERT_RESOURCE_UPDATE (Trigger)

                
                    CREATE trigger [dbo].[TR_ITINERARYITEM_INSERT_RESOURCE_UPDATE] on [dbo].[ITINERARYITEM] after insert not for replication
                        as begin
                            declare @CURRENTDATE datetime;                                        
                            set @CURRENTDATE = GetDate();
                            
                            declare @CHANGEAGENTID uniqueidentifier;
                            exec dbo.USP_CHANGEAGENT_GETORCREATECHANGEAGENT @CHANGEAGENTID output;
                            
                            -- Update per-ticket consumable scheduled event itinerary item resources

                            update dbo.RESOURCE
                                set [QUANTITY] = [RESOURCE].[QUANTITY] - qty,
                                    CHANGEDBYID = @CHANGEAGENTID,
                                    DATECHANGED = @CURRENTDATE
                            from (
                                select [RESOURCE].ID, sum(EVENTRESOURCE.PERTICKETQUANTITY * ITINERARYATTENDEE.QUANTITY) as qty
                                from dbo.RESOURCE
                                    inner join dbo.EVENTRESOURCE on RESOURCE.ID = EVENTRESOURCE.RESOURCEID
                                    inner join inserted on EVENTRESOURCE.EVENTID = inserted.EVENTID
                                    inner join dbo.ITINERARYATTENDEE on inserted.ITINERARYID = ITINERARYATTENDEE.ITINERARYID
                                where [RESOURCE].ISPERTICKETITEM <> 0 and [RESOURCE].TYPECODE = 1    
                                group by [RESOURCE].ID) as VT
                            where [RESOURCE].ID = VT.ID
                        end